SU607050A1 - Degassing method - Google Patents

Description

The image relates to the mining industry and can be used to reduce the gazochnichnost preparatory workings during their penetration in gas-bearing formations.

There is a method of tsegazatsiya, which consists in the fact that the B sides of the preparatory production of a gas-bearing formation of the provoking well, ahead of the bottom of the production, which are connected to the gas-extracting

system ij.

The disadvantage of this method of degassing is low efficiency, due to the fact that at a high penetration rate the gas-bearing formation ahead of the development is practically not degassed.

The closest to the proposed method is the degassing of the nibrx mine workings, based on the fact that downhole and barrier wells are drilled in the array of gas-bearing formation, through the first they create fractures in the formation, for example, by hydrodissection, insulate them, and barrier wells connect to the gas removal system G21.

However, this method is also not sufficiently effective at high speeds because of the mass of the gas-bearing reservoir ahead of the production of which is degassed, and the gas released from the bottomhole well enters the bottom hole. the end of the drilling of barrier wells and their connection to the gas suction system.

In order to improve the degassing efficiency of the proposed method, first the barrier wells of the wells (and connect them to the degassing system, bottomhole wells are located near the production contour, and exposed surfaces of the formation are exposed to the gas-impermeable material.

On (} tig. 1 is a diagram of the degassing of a gas-bearing stratum at a penetration rate; Fig. 2 shows the layout of wells, for example, in a thin or medium reservoir thickness (section A-A in Fig. 1).

The method of degassing during the passage of mining operations is carried out as follows.

In the sides of the excavation 1 (see Fig. 1, conducted through the gas-bearing formation, they form niches 2, of which barrier wells 3 and 4 are parallel to the axis of production, sealed them and connected to the degassing system. Then, at the excavation contour parallel to its axis and barrier wells 3 and 4 lead downhole wells 5 and 6 (see Figs. 1 and 2), through which fractures are created in the formation to communicate with barrier wells. Downhole wells are isolated from the production by portable seals 7, which are located at a depth that is excluded or reduced to mi nimum air leaks. Gas from the downhole wells to the barrier is diverted through artificial exogenous fractures.

In order to increase the dilution in the barrier wells and eliminate air suction, exposed by the development of the surface of the formation, they are shotcrete the gas-impermeable material. .

The use of the method of degassing during the excavation of mine workings allows to increase the efficiency of degassing from ZO-40 to 5O-60%. Improving the efficiency of degassing contributes to ensuring safe working conditions for the gas factor, increasing the rate of excavation of the workings on the gas:)

Claims (1)

1. Guide to the degassing of coal mines (project), M., Institute of Mining, L. L. Skochinsky, 1973, p. 16-17. 2, Copyright certificate M 406018, cl. E 21 F 5 / GS, 1970. one / -H md 5 V Rig.2